Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lithium battery diaphragm capable of effectively improving safety performance

A lithium battery separator and safety performance technology, applied in the field of lithium battery separator materials, can solve the problems of high thermal shrinkage, low melting temperature of microporous film, and high micropore closing temperature, and achieve the effect of changing structure and crystallinity

Inactive Publication Date: 2019-09-20
曾新凤
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a lithium battery diaphragm that effectively improves the safety performance, which solves the problem of the polyethylene microporous membrane used in the current lithium battery diaphragm due to the high closing temperature of the micropores and the high melting temperature of the microporous membrane. Low and high thermal shrinkage rate, leading to technical problems that reduce the safety performance of the battery during use

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) 25g high-density polyethylene, 2g polystyrene, 100mL dimethyl ether, 1g antioxidant 1010 are added together in the reactor equipped with stirring device, heating device and nitrogen protection device, under nitrogen protection, the temperature is 170 °C and a rotation speed of 600 rpm for 2 hours to obtain a homogeneous solution;

[0022] (2) Afterwards, put the homogeneous solution prepared above into an electric heating mold, hot press at a temperature of 170° C. and a pressure of 8 MPa, and then quench in distilled water at 0° C. to obtain a film component;

[0023] (3) Use absolute ethanol to extract the liquid paraffin in the membrane component, then place it in a vacuum drying oven, vacuum dry it at a vacuum degree of 133Pa and a temperature of 60°C for 2 hours, and fix it with a clamping mold at 100°C. Heat setting for 3 minutes to prepare lithium battery separator;

[0024] (4) The performance test was carried out on the lithium battery separator prepared a...

Embodiment 2

[0026] (1) 35g high-density polyethylene, 5g polystyrene, 100mL dimethyl ether, 2g antioxidant 1010 are added together in the reactor equipped with stirring device, heating device and nitrogen protection device, under nitrogen protection, the temperature is 200 ℃, and the rotation speed was 800rpm for 3h to obtain a homogeneous solution;

[0027] (2) Afterwards, put the homogeneous solution prepared above into an electric heating mold, hot press at a temperature of 200° C. and a pressure of 12 MPa, and then quench in distilled water at 0° C. to obtain a film component;

[0028] (3) Use absolute ethanol to extract the liquid paraffin in the membrane component, then place it in a vacuum drying oven, vacuum-dry it at a vacuum degree of 133Pa and a temperature of 80°C for 3 hours, and fix it with a clamping mold at 100°C. Heat setting for 5 minutes to prepare lithium battery separator;

[0029] (4) The performance test was carried out on the lithium battery separator prepared abo...

Embodiment 3

[0031] (1) 30g high-density polyethylene, 3g polystyrene, 100mL dimethyl ether, 1.5g antioxidant 1010 are added together in the reactor equipped with stirring device, heating device and nitrogen protection device, under nitrogen protection, the temperature is React at 180°C and 700rpm for 2.5h to obtain a homogeneous solution;

[0032] (2) Afterwards, put the homogeneous solution prepared above into an electric heating mold, hot press at a temperature of 180° C. and a pressure of 10 MPa, and then quench in distilled water at 0° C. to obtain a film component;

[0033] (3) Use absolute ethanol to extract the liquid paraffin in the membrane component, then place it in a vacuum drying oven, vacuum-dry it at a vacuum degree of 133Pa and a temperature of 70°C for 2.5h, and fix it with a clamping mold at 100°C Carry out heat setting for 4 minutes to prepare lithium battery separator;

[0034] (4) The performance test was carried out on the lithium battery separator prepared above, a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
porosityaaaaaaaaaa
porosityaaaaaaaaaa
porosityaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of lithium battery diaphragm materials, and discloses a lithium battery diaphragm capable of effectively improving safety performance. The lithium battery diaphragm comprises the following raw materials based on parts by weight: 25-35g of high-density polyethylene, 2-5g of polystyrene, 100mL of dimethyl ether and 1-2g of anti-oxidant 1010. By the lithium battery diaphragm, the technical problems that a polyethylene micropore film used in an existing lithium battery diaphragm is high in micropore closing temperature, low in melting temperature and large in thermal shrinkage rate to cause that the safety of the battery during application is reduced is solved.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragm materials, in particular to a lithium battery diaphragm that can effectively improve safety performance. Background technique [0002] Lithium batteries are widely used because of their high energy density, no memory effect, long cycle life, and environmental friendliness. As the core material of lithium-ion batteries, the separator directly affects the energy density, power density, cycle life and safety of the battery. Polyethylene microporous membrane has good strength, resistance to electrolyte corrosion, non-toxic, cheap, and can be thermally closed at high temperature, becoming the main commercial separator. [0003] Polyethylene microporous membranes are usually prepared by a wet (thermally induced phase separation, TIPS) process, which can form approximately circular nanoscale pores. The polyethylene microporous membrane can close the micropores when the temperature is ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/411Y02E60/10
Inventor 曾新凤
Owner 曾新凤
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com